diff --git a/.travis.yml b/.travis.yml
index de2b1f7..a0a8f50 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,5 +17,8 @@ matrix:
     - python: pypy
     - python: pypy3
 
+install:
+  - pip install msoffcrypto-tool
+
 script:
   - python setup.py test